Street Fighter x Tekken have a gem system with you can put to customize your character, making him stronger or faster if certain conditions are met. There are also free gems, and in theory, the free ones are as good as the paid ones.

In theory, also, Pyro function perfectly without the Axtinguisher and the Equalizer is a sidegrade to the shovel.

It's expecting a bit too much for something they hope to make money within to be perfectly balanced with the free option.